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In this March 4, 2014, file photo, Brig. Gen. Jeffrey Sinclair leaves the courthouse following a day of motions at Fort Bragg, N.C. A news release Sunday, March 16, 2014, from lawyers representing Sinclair said that he will plead to lesser charges in exchange for having the sexual assault charges dropped along with two others that might have required Sinclair to register as a sex offender. Sinclair was accused of twice forcing a female captain to perform oral sex on him during a three-year extramarital affair. (AP Photo/The Fayetteville Observer, James Robinson, File)

FORT BRAGG, N.C. -- An Army general who admitted to inappropriate relationships with three soldiers who had served under his command pleaded guilty Monday to a host of lesser charges as prosecutors dropped the most serious -- sexual assault counts -- as part of a deal.

The hearing at Fort Bragg caps the high-profile prosecution of Brig. Gen. Jeffrey Sinclair. It comes as the military continues to grapple with revelations of sex crimes in its ranks and political pressure to address the issue. A sentencing hearing for Sinclair -- believed to be the highest-ranking U.S. military officer to face court-martial on sexual assault charges -- could begin as soon as Monday.

Sinclair pleaded to the lesser charges in exchange for the Army dropping sexual assault charges and two other counts that might have required him to register as a sex offender.

Sinclair, 51, had been accused of twice forcing a female captain under his command to perform oral sex during a three-year extramarital affair. The Associated Press does not generally identify alleged victims of sexual assault.

Defense attorney Richard Scheff said Monday that Sinclair is admitting to his mistakes, but added that the general is pleading guilty to behavior that likely wouldn't be criminal in the civilian world.

Scheff said he expected Sinclair to "to retire at a reduced rank and go home to his family." Scheff said he understands that the military needs to take a harder line against sexual assault but that there must be a balance: "It doesn't mean every complaint that's brought should go forward."

The Army's case against Sinclair started to crumble as questions arose about whether his primary accuser had lied in a pre-trial hearing. It was further thrown into jeopardy last week when Judge Col. James Pohl said the military may have improperly pressed ahead with the trial to send a message about its determination to curb rape and other widespread misconduct. Under the military code of justice, the decision was supposed to be decided solely on the evidence, not its broader political implications.

Ultimately, a judge will give Sinclair a sentence that can't exceed terms in the agreement struck between defense lawyers and military attorneys. The legal agreement is likely to require a punishment far less severe than the maximum penalties of 15 years in prison and dismissal from the Army.

Sinclair may face additional administrative penalties from the Army, which could force him to retire at reduced rank. That could cost Sinclair hundreds of thousands of dollars in pension benefits.

Retired Maj. Gen. Walt Huffman, a Texas Tech University law professor who previously served as the Army's top lawyer, said Sinclair could be busted back two ranks to lieutenant colonel because the affair at the heart of the case began before his most recent promotion.

Huffman also said it's possible the judge could sentence Sinclair to a punishment lower than what's called for in the plea agreement.

"If the judge determines he was a good soldier who served his country well other than his inability to control his zipper, then the judge might cut him a break," Huffman said. "But either way, his career in the Army is going to be over."

Sinclair's new plea agreement was approved and signed over the weekend by a high-ranking general overseeing the case, according to a copy provided by the defense team.

The married 27-year Army veteran pleaded guilty earlier this month to having improper relationships with three subordinate officers, including the female captain who accused him of assault. He also pleaded guilty to adultery, which is a crime in the military.

Under the plea deal reached over the weekend, Sinclair also admits to abusing a government credit card he used while traveling to visit his mistress.

Prosecutors did not comment on the deal or the case before Monday's hearing.

According to the defense, a separate agreement reached with Fort Bragg commander Maj. Gen. Clarence K.K. Chinn, who approved the plea deal, will dictate what punishments Sinclair will receive.

That part of the agreement will remain secret until after Pohl conducts the sentencing hearing. That process will include testimony from about 20 witnesses.

It was not immediately clear whether his primary accuser will be among those called to the stand.

At the hearing, Pohl will sentence Sinclair based on the evidence presented before unsealing the plea deal. Sinclair will receive whichever is the lesser punishment -- the judge's sentence or the negotiated pre-sentencing agreement with prosecutors.

Capt. Cassie L. Fowler, the military lawyer assigned to represent the accuser's interests, did not respond to a message seeking comment Sunday.

In a December letter, Fowler had argued to prosecutors that dismissing the sexual assault charges against Sinclair would not only harm her client, but would set back the military's broader fight to combat sexual assault.